Part of that might be the fact that coincident constarints do not show up in the sketch, the same way that others do (with a symbol).

I agree that it is sometimes hinderly, even though it´s less clutter. There is a similar small issue that sometimes makes me mad:
If , especially pointoncurve is there twice, you can´t select either of the overlaying icons , you allway have to use the constraint finder. Maybe some idea for a 0.19 wish to overwork constraint display in sketcher a little.

The point serves only as construction geometry. It is not possible to construct a sketch containing only a point as real geometry. (This would be desirable for Lofts which end in a single point.) This holds for the current version of 0.18, it might change in the future.

While it's correct with PartDesign AdditiveLoft, it seems possible with the Part Loft function.
I never tested myself, but it could be worth having a sidenote about that.

It should be thought about potential impacts. For me considering a point as a virtual geometry is meaningful.
As an exemple, I wouldn't that solver become less powerful because of that.
And honestly, using a point or a 1nm (nanometer) circle for lofting doesn't change things a lot.